TI-2026-52585 Aliases CVE-2026-74866 GHSA-gxm5-99cw-xjw9

@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name

LOW 32CWE-93Published 2026-08-21 · Updated 2026-08-21

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · Low · None
Fix status: Partial Red Hat: 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

@fastify/busboy is a multipart form-data parser for Node.js. Its multipart part-header parser splits header lines only on the two-byte carriage-return line-feed sequence, so a lone carriage return or line feed embedded in a part header is not treated as a line break and is carried verbatim into the parsed Content-Disposition filename and field name handed to the application. An attacker who uploads a file whose filename or field name contains a bare carriage return or line feed can inject control characters into consumers that trust the parser to return clean values, enabling filesystem filename pollution, log forging, or header injection when the value is forwarded to a carriage-return-sensitive sink. All versions of @fastify/busboy up to and including 3.2.1 are affected. The issue is fixed in version 3.2.2, which rejects any header line that still contains a bare carriage return or line feed. Users should upgrade to 3.2.2, and consumers such as @fastify/multipart should bump their @fastify/busboy dependency to pull in the fix.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00326 25th percentileScored 2026-11-07

Fix Partial @fastify/busboy (@fastify/busboy): 3.2.2@fastify/busboy (npm): 3.2.2Red Hat: 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
fastify	@fastify/busboy	before 3.2.2	3.2.2	Patch available	CNA
—	@fastify/busboy (npm)	before 3.2.2	3.2.2	Patch available	GHSA-gxm5-99cw-xjw9

@fastify/busboy Vendorfastify Affected before 3.2.2 Fixed in 3.2.2 Patch available CNA
@fastify/busboy (npm) Vendor— Affected before 3.2.2 Fixed in 3.2.2 Patch available GHSA-gxm5-99cw-xjw9

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:fastify:fastify\/busyboy::::::node.js::*	before 3.2.2	Vulnerable	fastify

cpe:2.3:a:fastify:fastify\/busyboy:*:*:*:*:*:node.js:*:* Versions before 3.2.2 Vulnerable ·fastify

Remediation

Fix · CNA @fastify/busboy (@fastify/busboy) Fixed in 3.2.2
Fix · GHSA-gxm5-99cw-xjw9 @fastify/busboy (npm) Fixed in 3.2.2 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat AMQ Broker 7	Affected	No fix yet: Fix deferred
Red Hat Ceph Storage 8	Affected	No fix yet: Fix deferred
Red Hat Ceph Storage 9	Affected	No fix planned: Out of support scope
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet: Fix deferred
Red Hat OpenShift Container Platform 4	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-74866
2026-10-06 Alias added: GHSA-gxm5-99cw-xjw9
2026-10-06 Fix available: npm/@fastify/[email protected] · GHSA-gxm5-99cw-xjw9
2026-10-06 CVSS score added · GHSA-gxm5-99cw-xjw9
2026-10-06 Weakness changed · GHSA-gxm5-99cw-xjw9
2026-10-06 6 new references · GHSA-gxm5-99cw-xjw9

References

Advisory 3

Other 3

TI-2026-15867 @fastify/busboy vulnerable to Denial of Service via oversized multipart boundary CVSS 3.1HIGH 7.5
TI-2026-15865 @fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences